From owner-freebsd-questions Sat Apr 3 17: 4:48 1999 Delivered-To: freebsd-questions@freebsd.org Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (Postfix) with ESMTP id D7D7F14BDB for ; Sat, 3 Apr 1999 17:04:42 -0800 (PST) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id KAA25836; Sun, 4 Apr 1999 10:32:45 +0930 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id KAA04145; Sun, 4 Apr 1999 10:32:43 +0930 (CST) Message-ID: <19990404103242.L2142@lemis.com> Date: Sun, 4 Apr 1999 10:32:42 +0930 From: Greg Lehey To: mike@seidata.com, freebsd-questions@FreeBSD.ORG Subject: Configuring Mylex DAC960SX (was: RAID) References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: ; from mike@seidata.com on Sat, Apr 03, 1999 at 06:30:51AM -0500 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Saturday, 3 April 1999 at 6:30:51 -0500, mike@seidata.com wrote: > Hey, > > I'm setting up a RAID5 array using a Mylex DAC960SX controller. The > Mylex has 6 channels... I have Adaptec 2940 and 3940 controllers at > my displosal. I'm using 18GB IBM DGHSU (XP?) drives (16 of them in > two 8-bay enclosures). > > I'm curious about the most efficient/robust way to configure the > array. Here's one way: > > +-------+ DC0 +-------+ > | Mylex |-------------| Bay 1 |--+ > +-------+ +-------+ | > | | > |HC0 +-------+ | > +------+ | Bay 2 |--+ > | 2940 | +-------+ > +------+ T > > DC0 - Drive Channel 0 > HC0 - Host Channel 0 > T - Terminator > > Another I've considered is: > > +-------+ DC0 +-------+ > | Mylex |-------------| Bay 1 |T > | |---------+ +-------+ > +-------+ DC1 | +-------+ > | | +---| Bay 2 |T > HC0| |HC1 +-------+ > +------+ > | 3940 | > +------+ > > Any comments or suggestions appreciated. I'm also looking for general > suggestions/precautions for using such an array with FreeBSD. I don't know the Mylex, but it seems unlikely that your first configuration can be more robust than the second. What happens to bay 2 if bay 1 fails? Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message